Based on logs from 60 wells located on the Norwegian Shelf, we concluded that compaction and velocity trends vary greatly with depth in different types of mudstones and shales (Storvoll et al., 2005). Japsen (2006), however, argues that compaction of shales can be represented by a linear velocity-depth trend as a function of the overburden stress and is therefore mainly sensitive to overpressure. In our opinion, the treatment of mudstones and shales as one rock type during depth conversion of seismic data, pore-pressure prediction, or basin modeling represents a descriptive approach, which fails to recognize the great...

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